linq - How to make Case-In-Sensitive with Linq

Question

EDIT:

Also like to know: what if; if i have a data that is not upper case? or have mixed of upper or lower case? how you will handle this?

i am trying to query my resultset

IQueryable<CategoryObject>  filteredCategories = _catRepo.GetAllEmployees();


 filteredCategories = filteredCategories.Where(c=> c.CategoryName.Contains("Blocks"));

However, i don't get any result becuase the CategoryName is For(Upper Case) in the database. I have no idea how to use contains to filter case insensitive string? I want basically if someone type like;

filteredCategories = filteredCategories.Where(c=> c.CategoryName.Contains("Blocks"));

OR

filteredCategories = filteredCategories.Where(c=> c.CategoryName.Contains("blocks"));

OR

filteredCategories = filteredCategories.Where(c=> c.CategoryName.Contains("blocKS"));

The result should be the same

Answer 1

尝试

filteredCategories = categoriesList.Where(c=> c.CategoryName.ToUpper().Contains("BLOCKS"));

这将消除任何案例问题。

Answer 2

你也可以试试：

filteredCategories = categoriesList.Where(c=> c.CategoryName.IndexOf("blocks", StringComparison.OrdinalIgnoreCase) != -1);

Answer 3

第一种方式，如前所述 - 使用 ToUpper()：

var filterString = "bLoCkS"
filteredCategories = categoriesList.Where(c=> c.CategoryName.ToUpper().Contains(filterString.ToUpper()));

另一种方法 - 在您的数据库（表、字段）中使用不区分大小写的排序规则（将 SQL Server 排序规则从区分大小写更改为不区分大小写？）。